diff --git a/bundler/lib/bundler/rubygems_ext.rb b/bundler/lib/bundler/rubygems_ext.rb
index abdf19e6fead..1befb8435695 100644
--- a/bundler/lib/bundler/rubygems_ext.rb
+++ b/bundler/lib/bundler/rubygems_ext.rb
@@ -352,14 +352,6 @@ def extensions_dir
   require "rubygems/name_tuple"
 
   class NameTuple
-    def self.new(name, version, platform="ruby")
-      if Gem::Platform === platform
-        super(name, version, platform.to_s)
-      else
-        super
-      end
-    end
-
     def lock_name
       @lock_name ||=
         if platform == Gem::Platform::RUBY
diff --git a/lib/rubygems/name_tuple.rb b/lib/rubygems/name_tuple.rb
index 3f4a6fcf3dfb..7389a1df1b62 100644
--- a/lib/rubygems/name_tuple.rb
+++ b/lib/rubygems/name_tuple.rb
@@ -10,7 +10,11 @@ def initialize(name, version, platform=Gem::Platform::RUBY)
     @name = name
     @version = version
 
-    platform &&= platform.to_s
+    # Mimic rubygems before string platform in NameTuple
+    # platform &&= platform.to_s
+    return @platform = platform if platform.is_a?(Gem::Platform)
+    # end mimic
+
     platform = Gem::Platform::RUBY if !platform || platform.empty?
     @platform = platform
   end